user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Backdoor:Linux/Gafgyt.BA!xp
Backdoor:Linux/Gafgyt.BA!xp - Windows Defender threat signature analysis

Backdoor:Linux/Gafgyt.BA!xp - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Backdoor:Linux/Gafgyt.BA!xp
Classification:
Type:Backdoor
Platform:Linux
Family:Gafgyt
Detection Type:Concrete
Known malware family with identified signatures
Variant:BA
Specific signature variant within the malware family
Suffix:!xp
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Backdoor - Provides unauthorized remote access for Linux platform, family Gafgyt

Summary:

This is a concrete detection of Backdoor:Linux/Gafgyt.BA!xp, a Linux-based backdoor from the Gafgyt family known for targeting IoT devices. It attempts to gain unauthorized access by brute-forcing common credentials on systems like Dreambox or XMHDIPC, establishing remote control for various malicious activities. While primarily Linux, the presence of Windows-specific strings suggests potential broader attack capabilities or multi-stage components.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - |#d1e49aac-8f56-4280-b9ba-993a6d77406c (NID)
 - }#d1e49aac-8f56-4280-b9ba-993a6d77406c (NID)
 - &|#b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4 (NID)
 - &}#b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4 (NID)
 - C|#be9ba2d9-53ea-4cdc-84e5-9b1eeee46550 (NID)
 - C}#be9ba2d9-53ea-4cdc-84e5-9b1eeee46550 (NID)
 - |#7674ba52-37eb-4a4f-a9a1-f0f9a1619a2c (NID)
 - }#7674ba52-37eb-4a4f-a9a1-f0f9a1619a2c (NID)
 - !#HSTR:IntentBase64 (PEHSTR_EXT)
 - ToBase64String (PEHSTR_EXT)
 - !#HSTR:StringCodeForMshta.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.C!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.L!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.O!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRegsvr32.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRundll32.A!pli (PEHSTR_EXT)
 - rundll32 (PEHSTR_EXT)
 - !#HSTR:StringCodeForBITSJobs.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForPowerShell.G!pli (PEHSTR_EXT)
YARA Rule:
rule Backdoor_Linux_Gafgyt_BA_2147817853_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Backdoor:Linux/Gafgyt.BA!xp"
        threat_id = "2147817853"
        type = "Backdoor"
        platform = "Linux: Linux platform"
        family = "Gafgyt"
        severity = "Critical"
        info = "xp: an internal category used to refer to some threats"
        signature_type = "SIGNATURE_TYPE_ELFHSTR_EXT"
        threshold = "6"
        strings_accuracy = "High"
    strings:
        $x_2_1 = "dreambox" ascii //weight: 2
        $x_2_2 = "xmhdipc" ascii //weight: 2
        $x_1_3 = "admin1234" ascii //weight: 1
        $x_1_4 = "klv123" ascii //weight: 1
        $n_1_5 = "com.bitdefender" ascii //weight: -1
    condition:
        (filesize < 20MB) and
        (not (any of ($n*))) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: mips
26e1c7ac50319b3bacf336cbaaec770caac9bc9ceb6b9b87fceca53ecef664ff
29/01/2026
→VirusTotal↓Download Sample
Filename: arm5
fe9e87095153191ba77fd7eed720b0b1ac1ebd39176c9b9926b2af899b585075
29/01/2026
→VirusTotal↓Download Sample
Filename: mipsel
50825416445643e9f0395618392e964f6668bd7090cce27dc5e61421b12523b5
29/01/2026
→VirusTotal↓Download Sample
Filename: arm
b3a8a0f242041630931fbe99484290b342866b3c98e658fe83961d0f4219e91d
29/01/2026
→VirusTotal↓Download Sample
Filename: arm7
80ee20cbbb9ae55730cbc841c0581642f9245b27627ae2a61f6827803d304b8e
29/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate any affected Linux or IoT systems. Change all default and weak credentials, ensure firmware and software are up to date on IoT devices, and enforce strong, unique passwords. Perform a full system scan with updated security software to remove the malware and monitor network traffic for any command-and-control activity.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 22/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
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